Sanding unit



FIG. 1 is a perspective view of a sanding unit showing my new design;

FIG. 2 is a right side view thereof, the left side view being a mirror image;

FIG. 3 is a front view thereof, the rear view being a mirror image;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof. 

The ornamental design for a sanding unit, as shown and described. 